New 'delivery systems' protect vitamins and medications and improve absorption, with options including liquids, soft gels, powders and sprays; how do you choose the right one?

In her book 'True Age,' gerontologist Dr. Morgan Levine, 41 with a biological age of 36, explains why chronological age is just a number, how to easily calculate biological age and which changes can help slow it down

A new study shows why the same cold virus causes mild sniffles in some people but severe illness and asthma flare-ups in others, finding that the difference depends on how fast and how strongly the immune system reacts in the first hours after infection